Well I am glad to see nobody has had any noteable issues arrise from jailbreaking their iDevice. Personally I myself have had great luck on my two older iPhone 3G's. They of course are running iOS 4.2.1 and their basebands are iPad's.

However when I tried jailbreaking my 4S I encountered the following problems.

So since my iPhone 4S is new (I just recived it from AT&T on Feb 24) and the jailbreak(Greenpois0n) has been out for awhile that somebody may have had the same problems, if not additional ones, that I had.

Things like CallBar (use your phone from the status bar - without interrupting anything), SBSettings (quick access to some Settings actions such as Bluetooth, WiFi, etc), biteSMS (SMS/MMS messaging on steroids!), DeleteAll (one-click clean of e-mail Trash), Activator (do everything with gestures; never use your home button again), iKeywi (have a programmable 5th row on keyboard), Overboard (see all your pages at a glance - go to them on the second glance), Move2Unlock (gesture-based phone unlock), PhotoAlbums+ (actually MOVE photos to another album in the Photo app, not just link them), Springtomize2 (many reasons) and Zephyr (an iPhone with iPad-like multigestures).

There's a whole bunch of tweaks, these are just the ones I have and find useful. I won't even get into the theming aspect of it. Have a browse through [the whole] Jailbreaking section of this forum and you'll see a whole bunch of folk are enjoying a whole bunch of "stuff" with jail breaking.

And, to bring this back on topic, I have all that I mentioned above, plus others, plus some themes and my iPhone is running fine; it's not bogging down, not crashing, i get great signal, apps don't crash and, as far as I can tell, there's no battery issues.

Again, zero issues with the jail breaking, whether it was with the tool TO jail break or running of a jail broken phone. If a person sticks with the more tried and true tweaks from Cydia and stays away from the dodgy stuff - the phone is fine. Of course and as always, YMMV.

I'm using most of the tweaks that you referred above. Bitesms is a great Addon to iPhone in my opinion. I also tried inteliscreenx and lockinfo but didn't like it much ( I think it's not much benefits in my opinion).
What I realized with practice is that we have to be careful to choose the tweaks/apps to install in Cydia because some of the offers are not compatibly with our iOS or with one app/tweak already installed.
Had a problem with bigify that made me have a lot of headache untill I discover what was the problem.
What I noticed too was that sometimes some apps where always crashing. Safari, YouTube, mail and tapatalk are some examples. Some of them where solved with a reboot, others was more complicated.
When I get my iPhone with too much problems, I just clean it up and update everything and start from scratch.
I think jailbreaking and installing and testing and "playing around" with an iPhone is for someone that likes to "play around" and not only use just the iPhone as a normal user.
Jailbreak is a risky funny way to make our iPhone with much better performance and productivity. But it may go wrong for some point and.... **** happens we just have to have our backups done daily!

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